Leukemia Virus, MurineMoloney murine leukemia virusLeukemia Virus, FelineLeukemia Virus, BovineLeukemiaFriend murine leukemia virusLeukemia, ExperimentalAKR murine leukemia virusLeukemia, Myeloid, AcuteHuman T-lymphotropic virus 1Abelson murine leukemia virusVirus ReplicationReceptors, VirusCell LineLeukemia Virus, Gibbon ApeLeukemia, Lymphocytic, Chronic, B-CellRauscher VirusRetroviridaeRNA VirusesGene Products, taxRetroviridae InfectionsLeukemia, LymphoidMolecular Sequence DataGenes, ViralDNA, ViralVaccinia virusDefective VirusesVirus CultivationEnzootic Bovine LeukosisRNA, ViralLeukemia, Myelogenous, Chronic, BCR-ABL PositiveViral ProteinsVirus AssemblyProvirusesBase SequenceTumor Virus InfectionsLeukemia, T-CellRNA-Directed DNA PolymeraseGammaretrovirusCell Transformation, ViralMice, Inbred AKRGene Products, gagAntigens, ViralAmino Acid SequenceSimian virus 40Virus IntegrationVirus SheddingSarcoma Viruses, MurineRetroviridae Proteins, OncogenicVirus DiseasesLeukemia-Lymphoma, Adult T-CellOncogenic VirusesHuman T-lymphotropic virus 2DeltaretrovirusVirionPrecursor Cell Lymphoblastic Leukemia-LymphomaRepetitive Sequences, Nucleic AcidGene Expression Regulation, ViralGenetic VectorsRadiation Leukemia VirusMice, Inbred StrainsPlant VirusesDNA VirusesSindbis VirusHylobatesGene Products, envAvian leukosis virusMink Cell Focus-Inducing VirusesCells, CulturedLeukemia, FelineT-LymphocytesMeasles virusTransfectionHTLV-I InfectionsInfluenza A Virus, H1N1 SubtypeGene Products, rexLymphomaLeukemia, Monocytic, AcuteTranscription, GeneticPreleukemiaViral Envelope ProteinsRabies virusLeukemia, Radiation-InducedLeukemia, Hairy CellGenes, pXPolymerase Chain ReactionRecombination, GeneticInfluenza A Virus, H5N1 SubtypeTerminal Repeat SequencesCatsVirus Activation3T3 CellsGenes, envMice, Inbred C57BLHelper VirusesVesicular stomatitis Indiana virusDeltaretrovirus InfectionsMinkSpecies SpecificityViral Plaque Assay